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Our 'SAPPHIRE' bikini feels especially chic thanks to the reverse triangle cups. It's cut from our soft stretch fabric and ties as a halter neck. The flattering diamante detail thong bikini bottoms.. Model wears UK size Small. Material:. Matte Stretch fabric (88% Polyamide, 12% Elastane). Stretch Type: Stretchy. Gentle wash. Item runs true to size chart and is cut to suit our size chart. Please refer to our size chart for the best fit. Do not size up or down.